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Cactus Code Thorn EOS_Base
Author(s) : Tom Goodale
Maintainer(s): Cactus team
Licence : LGPL
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1. Purpose
This thorn provides a registration mechanism for various EOS.
These EOS can then be used by hydrodynamical routines.
Usage:
Creation of EOS:
A thorn providing an EOS should register that it does so by creating
an EOS handle with
int EOS_RegisterMethod(const char *name)
which returns a handle by which this EOS is referenced.
This handle can also be obtained at any time by calling
int EOS_Handle(const char *name)
Once the handle is created it can be used to register individual EOS
functions. There are five of these
EOS_RegisterPressure (int handle, CCTK_REAL (*func)(CCTK_REAL, CCTK_REAL))
registers a function which returns pressure
as a function of rest mass density and specific internal energy
EOS_RegisterSpecificIntEnergy(int handle, CCTK_REAL (*func)(CCTK_REAL, CCTK_REAL))
registers a function which returns specific internal energy
as a function of rest mass density and pressure
EOS_RegisterRestMassDens (int handle, CCTK_REAL (*func)(CCTK_REAL, CCTK_REAL))
registers a function which returns rest mass density
as a function of specific internal energy and pressure
EOS_RegisterDPressByDRho (int handle, CCTK_REAL (*func)(CCTK_REAL, CCTK_REAL))
registers a function which returns the derivative of pressure by
rest mass density
as a function of rest mass density and specific internal energy
EOS_RegisterDPressByDEps (int handle, CCTK_REAL (*func)(CCTK_REAL, CCTK_REAL))
registers a function which returns the derivative of pressure by
specific internal energy
as a function of rest mass density and specific internal energy
Usage from Fortran:
The Fortran usage is the same as the C usage. If you register a
function from Fortran it is assumed to be a Fortran function.
Use of EOS by Hydrodynamics thorns:
There are five corresponding calling functions:
pressure = EOS_Pressure(handle, rho, eps)
eps = EOS_SpecificIntEnergy(handle, rho, pressure)
rho = EOS_RestMassDens(handle, eps, pressure)
dpdrho = EOS_DPressByDRho(handle, rho, eps)
dpdeps = EOS_DPressByDEps(handle, rho, eps)
each of these takes a handle as first argument, which should be
retrieved with
handle = EOS_Handle(name)
where 'name' is the name of the EOS.
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